Chert / Jasper / Agate (Chalcedony Group)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
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Calcite crystal
Calcite (calcium carbonate, CaCO₃)
mineral
Chert (Polished/Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Petrified Palmwood
Palmoxylon (fossilized monocot xylem)
sedimentary
Tumbled chert or flint pebble
Microcrystalline quartz (SiO₂), likely chert; exact variety uncertain from the image
sedimentary
Chert (Black Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (with various hydrocarbon compositions)
mineral
Moss Agate
Silicon dioxide (SiO2) with inclusions
Mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Argillaceous Shale
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
fossil
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Trace Fossil (Lichenandites or Rhynie Chert Chert with Microfossils)
Trace fossil in microcrystalline quartz (SiO2)
fossil
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
sedimentary
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Chert (or Fossiliferous Limestone)
Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)
sedimentary
Fossilized Bark
Lepidodendron / Sigillaria fossil impression
fossil
Chert (Flint) with Limestone Matrix
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Flower Jasper
Agatized Fossil Coral / Chalcedony (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Fossiliferous Limestone
Calcareous biomicrite / Calcium Carbonate (CaCO3)
sedimentary
Fossilized Bone (Petrified Bone)
Permineralized Vertebrate Remains
sedimentary
Chert Nodule
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin, C10H16O)
gemstone
Moqui Marble (Shaman Stone)
Ironstone Concretion (Goethite/Hematite Shell)
sedimentary
Pyrite in Shale
Iron Disulfide (FeS2) in Sedimentary Shale
mineral
Amber
Succinite (fossilized resin, C10H16O)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Turtle Stone / Septarian Nodule (Water-worn)
Septarian Concretion
sedimentary
Hag Stone
Perforated Flint / Chert Node
sedimentary
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Chert (Flint) with Iron Staining
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Jasper (specifically a banded or dark variety)
Silicon Dioxide (SiO2) with impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossilized Shark Tooth
Chondrichthyes (class) fossilized tooth
fossil
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral